MEEG 681 / MEEG481
Computer Solution of Engineering Problems
Computer Session 9b

Repeat the same problems solved in session 9, using FLUENT.
 

Laminar flow: 

Start Fluent/2D

1. Read mesh file: File - Read - Case

2. Scale the grid: Grid - Scale ....
   Under unit conversion, select "in" for "Grid was Created In"
   Then Click "Scale"
   Click "Change Length units" to set inches as the working units for length
   Click "Close"
   
3. Define - Models - Solver 
   Solver = Segregated
   Time = Unsteady
   Unsteady Formulation = 2nd-order Implicit

4. Define - Model - Energy 
   Check "Energy Equation"

5. Define Materials to specifiy all parameters

6. Define Boundary Conditions
   Define - User-Defined - Interpret .... 
         Interpret the source code inlet_x_velocity.c
   Define - Boundary Conditions to define inflow1 and inflow2 

7. Solve - Initialize - Initialize
   Set velocity to zero, temp to 283.0K

8. Solve - Monitors - Residual

9. File - Write - Autosave 
   set frequency = 5

   Solve - Animate - Define
   Every 1 time step, 
   Define In Memory, Window=1 Set, 
      Contours/temperature/
   OK - OK

10. Solve - Iterate
   Time step size = 0.1
   Number of Time steps = 100
   Maximum iterations per step = 800
   Truncation error = 0.001
   Ending time = 800.
   Maximum time step size = 10.

Notes: The solution was actually done in 99 time steps.

Play an animation movie based on a FLUENT simulation- temperature evolution: Movie
 


Comparing steady-Steady solution with FIDAP - temperature profile at output:



Turbulent Flow: 

Start Fluent/2D

1. Read mesh file: File - Read - Case

2. Scale the grid: Grid - Scale ....
   Under unit conversion, select "in" for "Grid was Created In"
   Then Click "Scale"
   Click "Change Length units" to set inches as the working units for length
   Click "Close"

3. Define - Solver (use default)

4. Define - Viscous (pick standard k-epsilon)

5. Define - Model - Energy
   Check "Energy Equation"

6. Define Materials to specifiy all parameters

7. Define Boundary Conditions
   inflow1: x-velocity = 10 m/s
            y-velocity = 0
            temperature = 283K
            Turbulence spcficication method = intensity and hydraulic diameter
            turbuelnce intensity = 5%
            hydraulic diameter = 32 in

   inflow2: x-velocity = 0 m/s
            y-velocity = 10 m/s
            temperature = 330K
            Turbulence spcficication method = intensity and hydraulic diameter
            turbuelnce intensity = 5%
            hydraulic diameter = 8 in
   outlet:  (only when flow enters the domain through this boundary, does note apply)
            total temp = 283
            Turbulence spcficication method = intensity and hydraulic diameter
            turbuelnce intensity = 5%
            hydraulic diameter = 32 in

8. Solve - Initialize - Initialize
   Use inflow1 to initialize

9. Solve - Monitors - Residual

10. Solve - Iterate


Comparing solutions with FIDAP:

Temperature profile at output



K.E. profile at outlet


Dissipation rate profile at outlet